Tandem attachment for bicycles.



No. 637,768. Patented Nov. 28. I899. T. J. H. DERMODY.

TANDEM ATTACHMENT FOR B ICYCLES.

KAppljcation filed Mar. 24. 1899.) (No Model.) 2 Sheets-Sheet l.

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No. 632,768. Patented Nov. 28, I899.

T. J. H. DERMODY.

TAND EM ATTACHMENT FOB BICYCLES. (Application filed Mar. 24, 1899.)

(No Model.) 2 Sheets-Sheet 2.

WlTNE'SSES, '|NVE.NTOR

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UNITED T STATES THOMAS J. H. DERMODY,

PATENT Gr nch.

OF CHICAGO, ILLINOIS.

TANDEM ATTACHMENT FOR BICYCLES.

SPECIFICATION forming art of Letters Patent No. 637,768, dated November as, se'd.

Application filed March 24, 1899.

To all whom it may concern:

Beit known that I, THOMAS JOSEPH HENRY DERMODY, a citizen of the United States, residing in the city of Chicago, county of Cook, and State of Illinois, have invented a new and useful Tandem Attachment for Bicycles, of which the following is a specification.

My invention relates to the conversion of bicycles from a given carrying capacity to a higher carrying capacity.

My object is to provide a bicycle attachment having adjust-able parts, allowing it to be applied to 'frames of usual construction and of varying heights and lengths.

In the accompanying drawings,which illustrate my invention in connection with a single-wheel frame for converting the same to a tandem frame, Figure l is a View in side elevation of the bicycle-frame provided with the attachment; Fig. 2, a View of the attachment detached; Fig. 3, a broken vertical section of the cross strut or brace and attendant parts of the attachment; Fig. 4, a sectional View of an adjustable upward extension of said brace; Figs. 5 and 6, respectively, plan and side views of the rear extension of said attachment adapted to be fixed to frames of varying length; and Figs. 7 to 12, inclusive, details of the parts combined in Fig. 3.

In the preferred construction the attachment comprises forwardly and upwardly inclined rigid tubular members A A, connected at their front ends by a suitably-disposed steering-head journal-bearing and at their rear ends by a substantially horizontally-disposed tubular bottom chord or member; a tubular strut or cross-brace G, formed integrally with or firmly secured to the members A A; a journal-box or hanger-shell at the junction of the cross-brace, the lower inclined member A, and the horizontallydisposed member mentioned; a rearward extension B at the junction of the horizontal member and the upper inclined member A, adapted to pass beneath the hanger of the bicycle-frame, to which the attachment is applied, and to be clampingly secured thereat; an upward .extension of the brace G composed of tubing G and a bar D extending within the same and brazed thereto, which bar is provided toward its lower end with a series of perforations E for receiving a bolt F, secured by a nut H,

Serial No. 710,401. (No model.)

thus forming means for adjustably securing the tube 0 to the brace-tube G, within which the tube 0 extends, and internally-threaded adjustable cones K, washers L, and lock-nuts M for firmly securing the stem 0 within steering-heads of varying sizes.

Bushings I and J within the upper and lower ends, respectively, of the cross-brace tube G afiord close-fitting guides for the tubular stem 0 and the bar D. These bushings may be brazed or otherwise rigidly secured to the interior of the tube or socket G.

The bolt F passes through a perforation in the tubing G and bushing J and through the properperforation of the bar D to cause the front end of the bicycle-frame to be supported at the desired height. The cones'K fit into the upper and lower cups or race members of the steering-head and are firmly clamped thereto.

In Fig. 1, P represents a clamp for securing the front seat-post shown to the upper end of the stem 0. For this purpose the upper end of said stem may be split, if desired, in the usual manner, though it is not so shown. The rear handle-bars may be secured either to the front seat-post or to the upper chord or member of the bicycle-frame proper, as is well understood.

The extension-bar B,which should be brazed or otherwise fixedly secured to the meeting tubular parts with which it connects, is pro vided with a series of perforations Q for receiving a clamp O. The barB passes beneath and afiords a rest for the adjacent hangershell of the main frame. Where the rear lower forksof the bicycle-frame extend from the hanger-shell in their bifurcated form the bolt of the clamp passes between the forks and the clamping block or head, bridges the space between the forks, and bears upon the upper surfaces thereof. Where a difierent form of rear fork is used, however, the form of clamp employed will be varied to suit the new conditions.

It appears from the foregoing description that the cones K are adjustable on the stem 0 to accommodate varying lengths of steering-heads, that the stem 0 is adjustable in the combined brace and socket G to accom modate frames ofvarying heights, and that the clamp O is adjustable on the extensionmy invention so long as these importantfea e ems bar B to accommodate frames of varying lengths. The forms of the several parts may be variously modified without departure from tures are retained. i

It is understood,'of course, that where the preferred conditions are present the stem of the front-wheel fork is adapted tofit either of the steering-heads shown, or, in otherword's,

that the two steering-heads are alike.

What I claim as new, and desire to secure y e te Pate t, f.

1. A frame attachment of the character described, provided with anadjust-ablestem for attachment to thesteering-head of a bicycle f ame, an w dj s e eenneet means et te. r f lowe pe t e e tteehment re the ey le-f me adj cen te e h ng r-shell, here y the ette h e t' m y he app ied. to am s of yin eig end h, substantially as and for the purpose set forth,

2- A frem e tee et ef he eheraet'er de eerihedrre d with n adj stabl et th adapted o pass h o gh. a s eer n -head et e hieye ereh and s pp ied. w t adj stable meet for en a n hehpper and e te ehds et' sai s e n ee n fer he nr -vhie l w th a, ea d x n i n a ng adjusta l mea s fer eenh e ihs t wi h h f am d iaeent ee ha g -S e h eb -the ettaeh. hea is su ed t i y a yin ehgth ef stee nged and f ve -yi eight and len h e rames s tan l y as an for he A .rn rpeee set fort A frame attachment of the character deeer h i e m r eihg sui b e r id th mhe eehelietl it s eer n -hee a d e. hah erhe meets, e e eer h e attachmen te YQ1Q- 'emQ- s n -h e e tee ware .ext n rd ng a t or. th etiieeeht hahse he of the h y leeihe and. means fetee tieg s id e wa d xteh ien to the i:

' yele-f ei e, ub n a y s an r the per pose set forth.

e. A. theme e h -h h o h eheree et: i

se hed, ee p sing i b e ri i memh re supp i d w t a te in -h d a d a han er sh 'm ene er ee n t e et e hmentte hi ye -f m s e r ng-heed, e rearward ex s n f e tli a e e he edieeeht heater-shel ef the eyel -f eihe. and meat er empihsly s ur n sa ext ns ee tethe etter rks ef the bi y eame in th rear-e 5 sh te an e eeh t h elly a end, er t e pee wee. et thf A fr the e t h ehte the eheree ee dee eer ihed. e ehriein su a le r id ete hh supp i d w th e st e -h ed. and a, han er he l me r ems e etteeh heht 29. a bicycle-frame steeringhead, a rearward exte s affording e t fer he adjace hee r-eh l' he bi y reme and. an

ieetttb e. lamp. ehhe e th a d. t teheieh. er eeth ng i t the y e-f ame i the ear per-nose et tor hof said hanger-shell, snbstantiallyas and for the purpose set forth.

I 6. A frame attachment of the character described, comprising. suitable rigid members,

provided with a steering-head and-a hangershell, means for securing the rear end of the atta'chmentto the lower portion of the bicycle frame, a tubular socket, a tubular stem projecting upwardly therefrom and adj ustably connected therewith, and means for securing saidstem to the steering-head of the bicyclerehtei s a t a ly s a d o the pu p set forth.

' "7. A'frame'attachment-of the character de= scribed, comprising suitable rigid members,

provided with a, steering-head and a hanger shell, means forsecnring the rear end of the attachment to the lower portion of the. bicycle= frame, a tubular socket, a tnhularstem projecting upwardly therefrom and adjustably connected therewith, and adjustable cones on said stern for engaging the upper and lower cups ofthe steer-ingehead ofthe bicycle-frame,

. substantially as and for the purpose set forth.

8, A frame attachment of'the'character dee seri ed, eohlp sing abl r g m mbe provided with. a. steeri g-h a and v hanger shell, means for securing the rear. end of the attachment tothelower portion of the. bicycleheme, a uhhle e ke a bul s e th ieetihg upwa d y fro said socket p ovided witha rig-id bar extending downwardly from its. le ter hdrpe fe et ens said, h an .2.0.1 1 eennection between bar and socket, substantially as a d. or t p rp e set r h- 9. A frame. attachment of the character described, comprising suitable, rigid members, provided with a steering-head and a hangerehel means foe securing the rear; end f he attachment to the QW hertien efv the iey rame, a tubular sachet, a ubular ste p jecting upwardly from said socket provided With a rigi a extend ng downw h y r its lower end, perforations in said bar, bolt eehhee ien bet-w en bar and soc e an ternally-threaded cones on said stem for enseein the. cups of he ee g-hea of the bicycle-frame, substantially as and for the phtp se set. e th- 10. Anattachinent ofthe nature. described, comprising members A A, a suitable steeringhead and'hangereshell, substantially horizontal bottom chord, a rearward extension B. provided with clamping means, a t-ubnlar come hihed er ee bra eendsoeket G, n djusta l stem Q ee neeted with said socket, a d mean te seething the stem to the steering-head of the bieye erframe, substantially as andtor the THOMAS; J- H- DERl I'QDY- W th sees HENRY Q JACOBS,

ALEQBD HQGLE. 

